Footwear sole



FIG. 1 is a perspective view of a footwear sole embodying my new design;

FIG. 2 is a bottom view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a front view thereof; and,

FIG. 6 is a rear view thereof.

The broken line showing a shoe upper throughout the views illustrates the portion of the design that forms no part of the claim. 

The ornamental design for a footwear sole, as shown and described. 